How to control the appearence of texture on certain number of faces, in Blender?
All your object is actually made of seperate meshes as we can see if you do a simple unwrap:

So in Edit mode select all and AltM &gt; Merge By Distance, then unwrap again. Also it is very high poly, are you sure you need so many faces? In that case press AltJ to untriangulate, then CtrlE &gt; Un-Subdivide, choose the ratio in the Operator box, then unwrap again.